Vertical crushing and grinding mill.



No. 856,311. PATENTED JUNE 11, 1907.-

T. L. & T. J. STURTEVANT. I

VERTICAL CRUSHING AND GRINDING MILL. Arrnrcnlon Hum mm 29. 1906.

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. Q I 7 521: 'QVSWI No.8561311. PATENTED'JUNE1L1907. T. L. & '1. J.STURTEVANT.

VERTICAL GRUSHING AND GRINDING MILL.

APPLICATION FILED JUNE 2a, 1006.

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UNITED STATES PATENT oEEIoE.

THOMAS LEGGETT STURTEVANT, OF QUINCY, AND THOMAS JOSEPH STUR- TEVANT, OFWELLESLEY, MASSACHUSETTS, ASSIGNORS TO STURTE VANT, MILL COMPANY, OFPORTLAND, MAINE, A CORPORATION OF MAINE.

VERTICAL CRUSHING AND GRINDING MILL.

Specification of Letters Patent.

Patented June 11, 1907.

Application filed J me 29, 1906. Serial No. 324,017.

To all whom, it may concern Be it'known that we, THOMAS LEGGETTSTURTEVANT and THOMAS JosEPH STURTE- VANT, citizens of the UnitedStates, residing, respectively, at Quincy and Wellesley, in the countyof Norfolk and State of Massachusetts, have invented or discoveredcertain new and useful Improvements in Vertical Crushing and GrindingMills, of which the following is a specification, reference being hadtherein to the accompanying drawings This invention relates to thatclass of crushing and grindingmills in which rotary crushing elementscarried by a vertical shaft co-operate .with non-rotating or normallystationary crushing elements fixed to the casing of the mill; and theinvention has for its object to provide a crusher, of the class referredto, which is of simple construction, which is well adapted for crushersof moderate size, in which the crushing elements are removable throughthe top of the mill casing, and in which the adjustment of the crushingelements for regulating the fineness of the output of the mill iseffected in a novel manner.

In the accompanying drawings Figure 1 is a vertical section of acrushing and grinding mill embodying the present invention, such sectionbeing taken in the line of the driving shaft of the mill. Fig. 2 is alsoa vertical section of the improved crushing and grinding mill taken in aplane at right angles to Fig. 1, and Fig; 3 is a horizontal section online 33, Fig. 1.

Referring to the drawings, 12 denotes the casing of the mill which ispreferably cast in one piece and which is provided at its lower partwith-suitable bearings 13 in which is journaled the driving shaft 14.The base portion of the mill comprises webs or brackets 15 surmounted bya sleeve or support 16 which receives a cup-like bearing 17 in which isstepped the vertical shaft 18 carrying a bevel gear 19 the hub portionof which is keyed to the said shaft and which beveled gear meshes with asmaller bevel gear or pinion 20 fixed to the driving shaft 14. Thevertical shaft 18 is provided with a square or polygonal portion onwhich are mounted the rotary crushing and grinding cones 21 and 22. Thelowermost grinding cone 22 is recessed at its lower part so as tooverhang the hub of the bevel gear 19 which extends within a sleeve 23supported by a flange 24 forming part of the mill casing, and WlllCllsleeve is overlapped by an inverted cup 25 the top of which surroundsthe square portion of the shaft 18 so that said inverted cup will rotatewith said shaft. This construction just described provides a dust-lockwhich prevents the material being crushed from working down in the lowerbearing of the shaft 18, and in order to further protect the said lowerbearing of said vertical shaft the bevel gear 19 is recessed beneath soas to overhang and provide a housing for the cuplike part 17 in whichthe said vertical shaft is stepped. Also the said bevel gear 19 is ofsuch construction as to overhang and cover the bevel pinion 20, theperimeter of said bevel gear extending practically to the outer face ofsaid pinion,-thereby preventing any material coming down from above fromgetting between the teeth of the said gear and pinion.

Co-operating with the rotary grinding and crushing cones 21 and 22 arethe non-rotating or normally stationary crushing and grinding shells orelements 26 and 27, said shells or elements being provided with internalteeth in the usual manner, and having their faces constructed so as toform a double angle with each other. Instead of depending upon avertical adjustment of the vertical shaft and of the rotary crushing andgrinding elements carried thereby, for the regulation of the fineness ofthe output of the mill, as has heretofore been customary, the stationarycrushing and grinding shells .or elements of the present improvedmachine are vertically adjustable relative -to the rotary crushing andgrinding elements, and the said stationary crushing and grinding shellsor elements are preferably elastically supported upon springs which willpermit them to yield vertically more or less, under strain, so as toavoid excessive jars or shocks. To this end the casing of the millcomprises internal supports 28 on which rest springs 29 which sustainthe weight of the lowermost shell 27 and also of the superposed shell26, said shell 26 being recessed for the reception of springs 30, whichmay be acted upon by regulating screws 31 tapped in the cap 32.

The said cap 32 has a hopper opening 33 and output of the mill will besomewhat coarser,

-as will be understood.

Instead of the depressing adjusting screws 31 lifting adjusting screwsmay be employed for regulating the output of the mill by varying thevertical position of the stationary crushing and grinding elements.

The open top of the mill casing 12, which is covered by the cap 32, isof such size as to permit the stationary crushing shells or ele ments 26and 27 to be inserted into or removed from the chamber of the millcasing through the said top; thus adapting the mill casing to be made ofa single casing, instead of being made in horizontally or verticallydivided sections, as has heretofore been necessary in order to permit ofthe proper assembling of all of the crushing elements, and of readyaccess thereto in vertical crushing and grinding mills of the class towhich this invention relates.

While it is deemed advisable to support the vertically adjustablenon-rotating or nor mally stationary crushing shells or elementselastically, and to provide for their vertical adjustment by compressingor relaxing the cushioning springs, we do not limit our invention tothis specific form of mounting the vertically adjusting stationarycrushing and grinding shells or elements, as vertical adjustment 0f thestationary crushing and grinding members or elements may be provided forby other means, as will be understood by those skilled in the art towhich this invention relates.

Having thus described our invention, we

claim and desire to secure by Letters Pat 1. In a crushing machine, thecombination with a casing having an open top, of a vertical shaft androtarycrushing elements carried thereby, non-rotating or normallystationary crushing elements elastically supported by said casing forvertical movement relative thereto, said latter elements presenting aninterior surface which converges downwardly for a portion of its lengthand diverges downwardly for another portion of its length, said normallystationary crushing elements being adapted to be inserted or removedthrough the open top of said casing, and a removable cap for said opentop.

2. In a crushing machine, the combination with a suitable casing, of avertical shaft and rotary crushing elements carried thereby, andnon-rotating or normally stationary crushing elements surrounding saidrotary crushing elements and elastically supported from below'on saidcasing for vertical movement relative thereto.

3. In a crushing machine, the combination with a suitable casing, of avertical shaft and rotary crushing elements carried thereby,non-rotating or normally stationary crushing elements, elastic supportsbelow said last-named elements interposed between the same and saidcasing and con structed to permit said elements to move away from saidrotary crushing elements, and means for adjusting said normallystationary crushing elements vertically for regulating the output of themill.

4. In a crushing machine, the combination with a vertical shaft androtary crushing elements carried thereby, of normally stationarycrushing elements surrounding said rotary crushing elements and havinginclined inner faces which form an angle with one another, a casingsurrounding said parts, and yielding means for supporting said normallystationary crushing elements, said means permitting vertical movement ofsaid last-named elements relative to said casing.

5. In a crushing machine, the combination with the open-topped casing 12having internal supports, the removable cap 32-, a vertical shaft havingan upper bearing supported by said cap, rotary crushing elements carriedby said shaft, non-rotating or stationary crushing elements surroundingsaid rotary crushing elements and of proper size to pass through theopen top of said casing, springs interposed between said supports andthe lowermost of said stationary crushing elements so as to sustain thelatter elastically from below, screws tapped in said cap, for adjustingthe said stationary crushmg elements vertically, and springs interposedbetween said screws and the uppermost of said stationary crushingelements.

6. In acrushing machine, the combination with a casing, of a verticalshaft within said casing, rotary crushing elements carried by saidshaft, non-rotating or normally stationary, vertically adjustablecrushing elements within said casing, springs by which said normallystationary crushing elements are elastically supported, from beneath,and means, operable entirely from above, and interposed between saidstationary crushing elements and said casing, for adjusting saidstationary crushing elements and for holding the same in adjustedposition.

7. In a crushing machine, the combination with a suitable casing, of avertical shaft within the same, rotary crushing elements carried by saidshaft, non-rotating or normally stationary crushing elements surroundingsaid rotary crushing elements, springs interposed between the lowermostof said normally stationary crushing elements and said casing by whichsaid normally stationary crushing elements are elastically supported,from beneath, and screws by which said springs may be compressed to 1vary the vertical positions of said normally stationary crushingelements and thereby regulate the output of the mill.

8. In a crushing machine, the combination with a suitable casing, ofrotary crushing elements within said casing, non-rotating or normallystationary crushing elements surrounding said rotary crushing elements,springs interposed between said casing and said normally stationarycrushing elements for elastically supporting the latter, adjusting meansfor forcing said normally stationary crushing elements downwardly inopposition to said springs, and springs interposed between saidadjusting means and the uppermost of said normally stationary crushingelements.

In testimony whereof we afliX our signatures, in presence of twowitnesses.

THOMAS LEGGETT STUR'IEVANT.

THOMAS JOSEPH STURTEVANT.

Witnesses:

W. H. ELLIS, F. B. HEOKER.

